Struts coming loose?

So I gather that I do not have the original bushings. I installed the Moog K7040 type, which came with cotter pins, which I had no use for since I have no holes. Someone prior had welded in a plate onto the K frame so the original type narrow bushings no longer work. So anyone know the torque? I may try to put a lock washer inbetween the nut and the washer. also it is worth noting the strut on the passender side sticks out into the radiator hose, so I put a rubber cap on it to keep it from rubbing a hole.